Machine for truing and dressing wrench-blanks



(No Model.) I I M. E. CAMPPIELD.

MACHINE FOR .TRUING AND DRESSING WRENCH BLANKS.

Patented Dec. 25, 1888.

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MATTIIEIV E. CAMPFIELD, OF PITTSBURG, ASSIGN ORLTO THE BROVN SPE- CIALTY MANUFACTURING COMPANY, OF ETNA, PEI NSYLV'AN'LA.

. MACHINE FOR TRUING AND DRES$|NG WRENCH-BLAMKS.

SPECIFICATION forming part of Letters Patent No. 395,213, dated December 25, 1888.

Application filed February 23, 1888. Serial No. 264,929. (No model.)

To aZZ whom it may concern:

Be it known that I, MATTHEW E. CAMPFIELD, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Truing and Dressing rench Blanks; and I do hereby declare the following to be a full, clear, and exact description of the inveir tion, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention comprises a machine for dressing and sizing wrench-blanks and other articles by which the two Opposite sides of the shank are simultaneously planed or dressed and the shank brought to the required thickness at a single operation.

The invention consists, broadly, in passing the blank to be dressed between two planingcutters, which are provided with cuttingteeth, and which are arranged at a distance apart corresponding with the thickness which the finished article is to have.

In the accompanying drawings, which illnstrate my invention, Figure 1 is a plan view of the machine. Fig. 2 is a longitudinal section of the same on the line 2 2, and Fig. 53 is a transverse section on the line 3 3.

The same reference-lottors designate the same parts in all the figures.

The frame of the machine is composed of parallel bars A A, which are suitably secured together at their ends and are suppm'ted upon legs a a a a. The bars A are a sufficient distance apart to receive between them the reciprocating plunger (1 c, by which the blanks to be dressed and sized are forced forward between planing-cuttersff The cutters f f are flat steel blocks, which are provided on their inner faces with l)ackwardly-iiicliiled cutting-teeth f, which plane the sides of a blank. forced through between them. The teeth are formed at an angle running from the top downward and forward, whereby they have a tendency to draw and hold the blank down as it is being forced through. Preferably, though not necessarily, as an essential feature of the invention, cutting-teethf are also formed on the upper edges of the blocks the plunger is at the limit of its rearward re- 55 ciprocation, there is a sufficient space between it and the cutting-teeth to receive the blank to be dressed, which is placed therein in vertical position, as indicated 1n F1g.2.

Then by the forwardreciprocation of the plunget it is forced through between the cutters f f into an open space (marked as) in front of the teeth, when it is ready to be removed from the machine.

The cutter-blocks f are preferably set with 6 5 their front ends a little closer together than their rear ends, so that the teeth f will act successively.

The plunger consists of a block, 6, which fits snugly between the bars A A, and has lateral top and bottom flanges, by which it is retained in place, and a forwardly-projecting arm or blade, (1, of a thickness to pass between the cutters ff. It is reciprocated by an eccentric, G, on a transverse driving-shaft, c, which passes through the bars A A at the rear end of the machine, the eccentric being connected with the plunger by an arm or pitman, 0, on the collar 0. The block has a socket in its rear face to receive the end of the arm or p'itman c, and the two are connected by a transverse pin or bolt, e. The socket is flared outwardly and the end of the arm 0 is rounded, as represented in Fig. 2, to permit the necessary vibrathm of the arm. The shaft e carries a driving pulley, B, through which power applied.

The bars A A are tied together by top and bottom tierods, a (1 ,130 prevent their springing apart when the machine is in operation.

The arm (Z of the plunger is supported and guided at its front end by l ateral ly pro j ectin g arms (1, which project into horizontal guideways d below the bars A.

\Vhile I have described a machine with two side bars,A A, one pair of cutters, ff, and one plunger, I'show in my drawings a double machine arranged and constructed to dress the four sides of a wrench blank. Since the shank is thicker in one direction than in the other, two machines are required to dress the four sides, and therefore, for convenience and economy of shop-room, I make the machines double, as represented in the drawings, with two pairs of cutters and two plungers. hen so constructed and arranged,the two eccentrics are set opposite to each other on the shaft, so that the two plungers will reciprocate in opposite directions and will therefore operate alternately.

Evidently the capacity of the machine may be multiplied to any extent desired without departing from the spirit of the invention.

WVhile I show and describe eccentrics for operating the plungers, evidently cranks may be used instead, these being well-known me chanical equivalents, and I therefore desire to have it understood that the invention is not to be limited to the use of eccentrics.

Having now described my invention, I claim as new 1. In a machine for sizing and finishing wrench-blanks and other articles, the combination, with the parallel bars A A, of oppositely-arranged planing-cutters f f, facing each other and affixed to the inner sides of the said bars, and a reciprocating plunger guided be- 2. In a machine for sizing and finishing wrench-blanks and other articles, the combination, with the parallel bars A A, of oppositely-arranged planing-cutters f f, facing each other and affixed to the inner sides of said bars, a reciprocating plunger guided between said bars, a driving-shaft, an eccentric or its mechanical equivalent on said shaft, and a connection between said eccentric and plunger, substantially as shown and described.

3. In a machine for sizing and finishing wrench-blanks and other articles, the combination, with the parallel bars A A, of oppositelyarranged planing-cutters f f, facing each other and alfixed to the inner sides of said bars, said cutters each having a series of downwardly and forwardly inclined cuttingteeth, and a reciprocating plunger guided between the bars A A to force the blanks between the cutters, substantially as shown and described.

In testimony whereof I aflix my signature in presence of two witnesses.

h' I I MATTHEW E. 2 CAMPFIELD.

mark.

IVitnesses:

A. H. DANIELS, GEORGE WANNER. 

